U.S. patent number 7,717,803 [Application Number 12/426,732] was granted by the patent office on 2010-05-18 for c-shaped golf club head.
This patent grant is currently assigned to Callaway Golf Company. Invention is credited to Thomas J. DiMarco.
United States Patent |
7,717,803 |
DiMarco |
May 18, 2010 |
C-shaped golf club head
Abstract
A C-shaped golf club head is disclosed herein. The body has a
striking plate wall, a crown section, a sole section and a rear
wall. The golf club head also has a plurality of weight members
positioned on the rear wall of the body. Each of the plurality of
weight members is movable along the rear wall.
Inventors: |
DiMarco; Thomas J. (Carlsbad,
CA) |
Assignee: |
Callaway Golf Company
(Carlsbad, CA)
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Family
ID: |
39498804 |
Appl.
No.: |
12/426,732 |
Filed: |
April 20, 2009 |
Prior Publication Data
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Document
Identifier |
Publication Date |
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US 20090203463 A1 |
Aug 13, 2009 |
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Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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11954422 |
Dec 12, 2007 |
7520820 |
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60869697 |
Dec 12, 2006 |
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Current U.S.
Class: |
473/334; 473/350;
473/349; 473/345; 473/335 |
Current CPC
Class: |
A63B
60/00 (20151001); A63B 53/0466 (20130101); A63B
60/02 (20151001); A63B 2053/0491 (20130101); A63B
53/0433 (20200801); A63B 2209/023 (20130101); A63B
2209/00 (20130101); A63B 53/0408 (20200801); A63B
53/0412 (20200801); A63B 53/0416 (20200801); A63B
53/0437 (20200801) |
Current International
Class: |
A63B
53/04 (20060101); A63B 53/06 (20060101); A63B
53/08 (20060101) |
Field of
Search: |
;473/324-350,287-292,256
;D21/733,759,734,735 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Passaniti; Sebastiano
Attorney, Agent or Firm: Catania; Michael A. Lo; Elaine
H.
Parent Case Text
CROSS REFERENCES TO RELATED APPLICATIONS
The Present Application is a continuation application of U.S.
patent application Ser. No. 11/954,422, filed on Dec. 12, 2007,
which claims priority to U.S. Provisional Patent Application No.
60/869,697, filed on Dec. 12, 2006, now abandoned.
Claims
I claim as my invention:
1. A golf club head comprising: a body having a front elongated
section, a heel end arm and a toe end arm, the front elongated
section having a striking plate wall and a rear wall, the heel end
arm having a rear wall, an external side wall and an internal side
wall, the toe end arm having a rear wall, an external side wall and
an internal side wall; and a plurality of weight members, a first
weight member of the plurality of weight members moveably
positioned on the rear wall of the heel end arm and movable along a
first track in a crown to sole direction, a second weight member of
the plurality of weight members moveably positioned on the rear
wall of the toe end arm and movable along a second track in a crown
to sole direction, a third weight member of the plurality of weight
members moveably positioned on the rear wall of the front elongated
section and movable along a third track in a heel to toe direction,
and a fourth weight member of the plurality of weight members
moveably positioned on the rear wall of the front elongated section
and movable along the third track in a heel to toe direction.
2. The golf club head according to claim 1 wherein the body has a
volume ranging from 420 cubic centimeters to 470 cubic
centimeters.
3. The golf club head according to claim 1 wherein the body is
composed of a material selected from the group consisting of
titanium, titanium alloy, steel, magnesium, magnesium alloy,
aluminum, aluminum alloy, pre-preg material, thermoplastic
polyurethane, and polycarbonate.
4. The golf club head according to claim 1 wherein each of the
plurality of weight members ranges in mass from 10 grams to 40
grams.
5. The golf club head according to claim 1 wherein each of the
plurality of weight members ranges in mass from 15 grams to 30
grams.
6. The golf club head according to claim 1 wherein the golf club
head has mass ranging from 190 grams to 220 grams.
7. The golf club head according to claim 1 wherein the golf club
head has a moment of inertia Izz about the center of gravity
ranging from 4000 g-cm.sup.2 to 5000 g-cm.sup.2.
8. The golf club head according to claim 1 wherein the golf club
head has a moment of inertia Iyy about the center of gravity
ranging from 2000 g-cm.sup.2 to 4000 g-cm.sup.2.
9. The golf club head according to claim 1 wherein the golf club
head has a moment of inertia Ixx about the center of gravity
ranging from 2000 g-cm.sup.2 to 4000 g-cm.sup.2.
10. The golf club head according to claim 1 wherein the striking
plate wall has variable face thickness.
Description
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
Not Applicable
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a golf club heads. More
specifically, the present invention relates to a golf club head
having a C-Shape.
2. Description of the Related Art
Numerous techniques have been used for weighting golf club heads in
order to gain better performance. In persimmon wood club heads,
weights were attached to the sole in order to lower the center of
gravity. The first metal woods had sufficient weight, however, the
weight distribution deterred slightly from performance. The
refinement of hollow metal woods with weighting on the sole
improved upon the performance of these clubs. An example of such
woods were the GREAT BIG BERTHA.RTM. HAWK EYE.RTM. drivers and
fairway woods, developed by the Callaway Golf Company of Carlsbad,
Calif., that used a tungsten screw in the sole of each titanium
club head body to vary the weight of the golf club head.
Another example is set forth in Helmstetter et al., U.S. Pat. No.
6,364,788 for a Weighting System For A Golf Club Head, which
discloses using a bismuth material within an internal cavity to add
mass to a golf club head, particularly a fairway wood.
Yet a further example is set forth in Evans et al., U.S. Pat. No.
6,409,612 for a Weighting Member For A Golf Club Head, which
discloses a weighting device composed of a polymer body with ports
to allow for placement of high density members such as tungsten
spheres.
Another example of additional weighting of a golf club head is set
forth in U.S. Pat. No. 5,447,309, which discloses the use of three
weights fixedly disposed within the interior of a club head to
provide a selected moment of inertia for the club head. Yet another
example is set forth in British Patent Application Number 2332149
for a Golf Club Head With Back Weighting Member, which discloses a
weight pocket in the exterior rear of a wood for placement of epoxy
inserts that vary in density.
In irons, weighting of the club head has assumed many variations.
One example is perimeter weighting in which the mass is shifted to
the perimeter of the club head such as the BIG BERTHA.RTM.
X-12.RTM. irons developed by the Callaway Golf Company and as set
forth in U.S. Pat. No. 5,282,625. An example of additional
weighting is set forth in U.S. Pat. No. 3,995,857 which discloses
the placement of tungsten inserts into the rear of an iron.
Another example of additional weighting is the GREAT BIG
BERTHA.RTM. TUNGSTEN-TITANIUM.RTM. irons, developed by the Callaway
Golf Company, which used a screw to attach a tungsten block to the
rear and sole of a stainless steel iron as set forth in U.S. Pat.
No. 5,776,010.
Yet another example is the GREAT BIG BERTHA.RTM.
TUNGSTEN-INJECTED.TM. HAWK EYE.RTM. irons, also developed by the
Callaway Golf Company, which feature an internal cavity with
tungsten pellets in a solder, as set forth in U.S. Pat. No.
6,210,290, for a Golf Club And Weighting System. The weighting of
putters has varied as with woods and irons.
An example of positioning mass in a golf club head for performance
is disclosed in Helmstetter et al., U.S. Pat. No. 6,739,983 for a
Golf Club Head With Customizable Center Of Gravity, which discloses
a method and golf club head which allows a golfer to select a
preferred center of gravity location for better ball striking.
A further example of positioning mass for performance is set forth
in Helmstetter, U.S. Pat. No. 5,785,605 for a Hollow, Metallic Golf
Club Head With Configured Medial Ridge, which discloses a golf club
head with a center of gravity located in vertical alignment with a
local zone defined by ridge on a sole of the golf club head.
However, prior technology have been similar in that the weighting
means, whether it is a medallion, plug, insert or the like, is a
static weight and mass. More precisely, once positioned on the club
head, the weight does not change. If a new weight is desired, then
the old weight is removed and an entirely new weight means is
placed on the golf club head. The weights may be ground to remove
mass in order to lower the weight, however, these prior art weights
cannot easily have their mass increased by the addition of
material.
Further, each of the prior art weighting means have a fixed and
unchangeable center of gravity ("CG") and fixed and unchangeable
moments of inertia ("MOI"). The CG cannot be moved and the MOI
cannot be increased or decreased without dimensionally changing the
prior art weighting means. Thus, the golf industry needs a
weighting mechanism that allows for greater flexibility to adjust,
the CG, MOI and also the swingweight on a golf club.
BRIEF SUMMARY OF THE INVENTION
The present invention is a C-shaped golf club head having
adjustable weights for fitting a golf club to a golfer.
One aspect of the present invention is a golf club head with a body
having a generally C shape. The body has a striking plate wall, a
crown section, a sole section and a rear wall. The golf club head
also has a plurality of weight members positioned on the rear wall
of the body. Each of the plurality of weight members is movable
along the rear wall.
Preferably, the body has a volume ranging from 420 cubic
centimeters to 470 cubic centimeters. More preferably, the body has
a volume ranging from 455 cubic centimeters to 465 cubic
centimeters.
Preferably, the body is composed of a material selected from the
group consisting of titanium, titanium alloy, steel, magnesium,
magnesium alloy, aluminum, aluminum alloy, pre-preg material,
thermoplastic polyurethane, and polycarbonate.
Preferably, each of the plurality of weight members ranges in mass
from 5 grams to 60 grams. More preferably, each of the plurality of
weight members ranges in mass from 10 grams to 40 grams. Even more
preferably, each of the plurality of weight members ranges in mass
from 15 grams to 30 grams.
Preferably, the golf club head has mass ranging from 150 grams to
350 grams. More preferably, the golf club head has mass ranging
from 180 grams to 250 grams. Even more preferably, the golf club
head has mass ranging from 190 grams to 220 grams.
Preferably, the golf club head has a moment of inertia Izz about
the center of gravity ranging from 3000 g-cm.sup.2 to 6000
g-cm.sup.2. More preferably, the golf club head has a moment of
inertia Izz about the center of gravity ranging from 4000
g-cm.sup.2 to 5000 g-cm.sup.2.
Preferably, the golf club head has a moment of inertia Iyy about
the center of gravity ranging from 2000 g-cm.sup.2 to 4000
g-cm.sup.2. More preferably, the golf club head has a moment of
inertia Iyy about the center of gravity ranging from 2500
g-cm.sup.2 to 3500 g-cm.sup.2.
Preferably, the golf club head has a moment of inertia Ixx about
the center of gravity ranging from 2000 g-cm.sup.2 to 4000
g-cm.sup.2. More preferably, the golf club head has a moment of
inertia Ixx about the center of gravity ranging from 2500
g-cm.sup.2 to 3000 g-cm.sup.2.
Preferably, the striking plate wall has variable face
thickness.
Preferably, the plurality of weight members is composed of four
weight members, with two of the weight members each movable along a
crown and sole axis, and two of the members each movable along a
heel to toe axis.
Another aspect of the present invention is a golf club head with a
plurality of movable weights. The golf club head also includes a
body having a front elongated section, a heel end arm and a toe end
arm. The front elongated section has a striking plate wall and a
rear wall. The heel end arm has a rear wall, an external side wall
and an internal side wall. The toe end arm has a rear wall, an
external side wall and an internal side wall. Each of the plurality
of first weight members is positioned on the rear wall of the front
elongated section. Each of the plurality of first weight members is
movable along the rear wall. At least one second weight member is
positioned on the rear wall of the heel end arm and movable along a
crown to sole axis. At least one third weight member is positioned
on the rear wall of the toe end arm and movable along a crown to
sole axis.
The body preferably has a volume ranging from 250 cubic centimeters
to 500 cubic centimeters. More preferably, the body has a volume
ranging from 420 cubic centimeters to 470 cubic centimeters. Even
more preferably, the body has a volume ranging from 455 cubic
centimeters to 465 cubic centimeters.
Preferably, the body of this embodiment is composed of a material
selected from the group consisting of titanium, titanium alloy,
steel, magnesium, magnesium alloy, aluminum, aluminum alloy,
pre-preg material, thermoplastic polyurethane, and
polycarbonate.
Preferably, each of the first weight members, the second weight
member and the third weight member ranges in mass from 5 grams to
60 grams. More preferably, each of the first weight members, the
second weight member and the third weight member ranges in mass
from 10 grams to 40 grams. Even more preferably, each of the first
weight members, the second weight member and the third weight
member ranges in mass from 15 grams to 30 grams.
Preferably, the golf club head of this embodiment has mass ranging
from 150 grams to 350 grams. More preferably, the golf club head of
this embodiment has mass ranging from 180 grams to 250 grams. Even
more preferably, the golf club head of this embodiment has mass
ranging from 190 grams to 220 grams.
Preferably, the golf club head of this embodiment has a moment of
inertia Izz about the center of gravity ranging from 3000
g-cm.sup.2 to 6000 g-cm.sup.2. More preferably, the golf club head
of this embodiment has a moment of inertia Izz about the center of
gravity ranging from 4000 g-cm.sup.2 to 5000 g-cm.sup.2.
Preferably, the golf club head of this embodiment has a moment of
inertia Iyy about the center of gravity ranging from 2000
g-cm.sup.2 to 4000 g-cm.sup.2. More preferably, the golf club head
of this embodiment has a moment of inertia Iyy about the center of
gravity ranging from 2500 g-cm.sup.2 to 3500 g-cm.sup.2.
Preferably, the golf club head of this embodiment has a moment of
inertia Ixx about the center of gravity ranging from 2000
g-cm.sup.2 to 4000 g-cm.sup.2. More preferably, the golf club head
of this embodiment has a moment of inertia Ixx about the center of
gravity ranging from 2500 g-cm.sup.2 to 3000 g-cm.sup.2.
Having briefly described the present invention, the above and
further objects, features and advantages thereof will be recognized
by those skilled in the pertinent art from the following detailed
description of the invention when taken in conjunction with the
accompanying drawings.
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS
FIG. 1 is a top plan view of a golf club head.
FIG. 2 is a rear view of a golf club head.
FIG. 3 is a front plan view of a golf club head.
FIG. 4 is a toe side view of a golf club head.
FIG. 5 is a heel side view of a golf club head.
FIG. 6 is a bottom plan view of a golf club head.
DETAILED DESCRIPTION OF THE INVENTION
A golf club 20 is illustrated in the figures. The golf club head 20
may be a driver or a fairway wood. The body 25 has a generally
C-shape. More specifically, the body 25 preferably has a front
elongated section 30, a heel end arm 35 and a toe end arm 40. The
front elongated section has a rear wall 45, the heel end arm has a
rear wall 46, and the toe end arm has a rear wall 47. A plurality
of weight members 50 are positioned on the rear walls. The weight
members 50 are movable along tracks 51 as shown in order to adjust
the center of gravity of the golf club head 20 and the moment of
inertia.
The golf club head 20 has a body 25 that is preferably composed of
a metal material such as titanium, titanium alloy, stainless steel,
or the like, and is most preferably composed of a cast stainless
steel material. The body 25 is preferably cast from molten metal in
a method such as the well-known lost-wax casting method. The metal
for casting is preferably is composed of 17-4 steel alloy.
Alternatively the body 25 is composed of a titanium or a titanium
alloy such as 6-4 titanium alloy, alpha-beta titanium alloy or beta
titanium alloy for forging, and 6-4 titanium for casting.
Additional methods for manufacturing the body 25 include forming
the body 25 from a flat sheet of metal, super-plastic forming the
body 25 from a flat sheet of metal, machining the body 25 from a
solid block of metal, electrochemical milling the body from a
forged pre-form, and like manufacturing methods.
The golf club head 20 preferably has a volume from 100 cubic
centimeters to 600 cubic centimeters, more preferably from 130
cubic centimeters to 475 cubic centimeters. When designed as a
fairway wood, the golf club head 20 preferably has a volume ranging
from 130 cubic centimeters to 300 cubic centimeters, and more
preferably from 150 cubic centimeters to 275 cubic centimeters. The
volume of the golf club head 20 will also vary between fairway
woods (preferably ranging from 3-woods to eleven woods). When
designed as a driver, the golf club head 20 preferably has a volume
ranging from 300 cubic centimeters to 500 cubic centimeters, and
more preferably from 350 cubic centimeters to 475 cubic
centimeters.
The golf club head 20 preferably has a mass ranging from 90 grams
to 250 grams, more preferably from 150 grams to 225 grams, and most
preferably from 180 grams to 221 grams. The mass of the golf club
head 20 will also vary between fairway woods (preferably ranging
from 3-woods to eleven woods) and a driver.
The weight member 50 is preferably composed of a high density
material having a density greater than the density of a typical
club head material, such as steel (density of 7.87 g/cc), or
titanium (density of 4.51 g/cc). Preferably, the weight member 50
is composed of tungsten (density of 19.25 g/cc), copper (density of
8.93 g/cc), gold (density of 19.28 g/cc), silver (density of 10.50
g/cc), palladium (density of 12.00 g/cc), platinum (density of
21.47 g/cc) or another similar material. A preferred material for
the weight member 50 is tungsten or tungsten alloy. An alternative
material is a nickel-tungsten-chromium alloy such as disclosed in
U.S. Pat. No. 7,004,853, for a High Density Alloy For Improved Mass
Properties In An Article, assigned to Callaway Golf Company of
Carlsbad, Calif., and hereby incorporated by reference in its
entirety. The weight member 50 preferably has a thickness ranging
from 0.2 centimeter to 2.0 centimeters, a height ranging from 0.5
centimeter to 4.0 centimeters and a length ranging from 1.0
centimeter to 5.0 centimeters. More preferably, the weight member
50 has a thickness ranging from 0.5 centimeter to 1.0 centimeters,
a height ranging from 1.0 centimeter to 2.0 centimeters and a
length ranging from 2.5 centimeter to 4.0 centimeters. The weight
member preferably has a mass ranging from 5 grams to 25 grams, more
preferably from 7 grams to 20 grams and most preferably 10
grams.
In determining a golfer's ball striking abilities, a method and
system such as disclosed in U.S. Pat. No. 6,821,209 for a Method
For Predicting A Golfer's Ball Striking Performance, assigned to
Callaway Golf Company of Carlsbad, Calif., which is hereby
incorporated by reference in its entirety.
The golf club head 20 preferably has a high coefficient of
restitution thereby enabling for greater distance of a golf ball
hit with the golf club of the present invention. The coefficient of
restitution (also referred to herein as "COR") is determined by the
following equation:
##EQU00001## wherein U.sub.1 is the club head velocity prior to
impact; U.sub.2 is the golf ball velocity prior to impact which is
zero; v.sub.1 is the club head velocity just after separation of
the golf ball from the face of the club head; v.sub.2 is the golf
ball velocity just after separation of the golf ball from the face
of the club head; and e is the coefficient of restitution between
the golf ball and the club face.
The values of e are limited between zero and 1.0 for systems with
no energy addition. The coefficient of restitution, e, for a
material such as a soft clay or putty would be near zero, while for
a perfectly elastic material, where no energy is lost as a result
of deformation, the value of e would be 1.0. The present invention
provides a golf club head 20 having a coefficient of restitution
ranging from 0.81 to 0.94, as measured under conventional test
conditions, and more preferably from 0.825 to 0.85.
The axes of inertia through the center of gravity of the golf club
head are designated X, Y and Z. The X axis extends from the
striking plate wall through the center of gravity, CG, and to the
rear of the golf club head 20. The Y axis extends from the toe end
of the golf club head 20 through the center of gravity, CG, and to
the heel end of the golf club head 20. The Z axis extends from the
crown section through the center of gravity, CG, and to the sole
section.
As defined in Golf Club Design, Fitting, Alteration & Repair,
4.sup.th Edition, by Ralph Maltby, the center of gravity, or center
of mass, of the golf club head is a point inside of the club head
determined by the vertical intersection of two or more points where
the club head balances when suspended. A more thorough explanation
of this definition of the center of gravity is provided in Golf
Club Design, Fitting, Alteration & Repair.
The center of gravity and the moment of inertia of a golf club head
20 are preferably measured using a test frame (X.sup.T, Y.sup.T,
Z.sup.T), and then transformed to a head frame (X.sup.H, Y.sup.H,
Z.sup.H). The center of gravity of a golf club head may be obtained
using a center of gravity table having two weight scales thereon,
as disclosed in U.S. Pat. No. 6,607,452, entitled High Moment Of
Inertia Composite Golf Club, and hereby incorporated by reference
in its entirety.
In general, the moment of inertia, Izz, about the Z axis for the
golf club head 40 of the present invention will range from 1900
g-cm.sup.2 to 3000 g-cm.sup.2, preferably from 1990 g-cm.sup.2 to
2500 g-cm.sup.2, and most preferably from 1990 g-cm.sup.2 to 2400
g-cm.sup.2. The moment of inertia, Iyy, about the Y axis for the
golf club head 42 of the present invention will range from 900
g-cm.sup.2 to 1700 g-cm.sup.2, preferably from 950 g-cm.sup.2 to
1500 g-cm.sup.2, and most preferably from 965 g-cm.sup.2 to 1200
g-cm.sup.2. Table One list the moments of inertia for a 3-wood golf
club head 40, a 7-wood golf club head 40, 9-wood golf club head 40
and 11-wood golf club head 40.
The body 25 is alternatively composed of a non-metal material,
preferably a composite material such as continuous fiber pre-preg
material (including thermosetting materials or thermoplastic
materials for the resin). Other materials for the body 25 include
other thermosetting materials or other thermoplastic materials such
as injectable plastics. Alternatively, the body 25 is composed of
low-density metal materials, such as magnesium or aluminum.
Exemplary magnesium alloys are available from Phillips Plastics
Corporation under the brands AZ-91-D (nominal composition of
magnesium with aluminum, zinc and manganese), AM-60-B (nominal
composition of magnesium with aluminum and manganese) and AM-50-A
(nominal composition of magnesium with aluminum and manganese). The
body 25 is preferably manufactured through metal-injection-molding.
Alternatively, the body 25 is manufactured through casting,
forming, machining, powdered metal forming, electro chemical
milling, and the like.
The striking plate wall has varying thickness. In a preferred
embodiment, the striking plate wall has a varying thickness such as
described in U.S. Pat. No. 6,398,666, for a Golf Club Striking
Plate With Variable Thickness, which pertinent parts are hereby
incorporated by reference. Other alternative embodiments of the
thickness of the striking plate wall are disclosed in U.S. Pat. No.
6,471,603, for a Contoured Golf Club Face and U.S. Pat. No.
6,368,234, for a Golf Club Striking Plate Having Elliptical Regions
Of Thickness, which are both owned by Callaway Golf Company and
which pertinent parts are hereby incorporated by reference.
Alternatively, the striking plate wall has a uniform thickness.
A preferred material is steel 4340, which is heat treated and then
coated with a titanium nitride. Titanium materials useful for the
striking plate wall include pure titanium and titanium alloys such
as 6-4 titanium alloy, SP-700 titanium alloy (available from Nippon
Steel of Tokyo, Japan), DAT 55G titanium alloy available from Diado
Steel of Tokyo, Japan, Ti 10-2-3 Beta-C titanium alloy available
from RTI International Metals of Ohio, and the like. Other metals
for the striking plate insert 40 include other high strength steel
alloy metals and amorphous metals. Such steel materials include
17-4PH, Custom 450, 455, 465 and 465+ stainless steels, AERMET 100
and AERMET 310 alloy steels, all available from Carpenter Specialty
Alloys, of Pennsylvania, and C35 maraging steels available from
Allvac of North Carolina. Such amorphous metals include beryllium
based alloys such as disclosed in U.S. Pat. No. 5,288,344, which
pertinent parts are hereby incorporated by reference, quinary
metallic glass alloys such as disclosed in U.S. Pat. No. 5,735,975,
which pertinent parts are hereby incorporated by reference, and
ternary alloys as disclosed in Calculations of Amorphous-Forming
Composition Range For Ternary Alloy Systems And Analyses Of
Stabilization Of Amorphous Phase And Amorphous-Forming Ability,
Takeuchi and Inoue, Materials Transactions, Vol. 42, No. 7, p
1435-1444 (2001), which pertinent parts are hereby incorporated by
reference.
In general, the moment of inertia, Izz, about the Z axis for the
golf club head 20 of the present invention will range from 3500
g-cm.sup.2 to 6000 g-cm.sup.2, preferably from 4000 g-cm.sup.2 to
5000 g-cm.sup.2, and most preferably from 4200 g-cm.sup.2 to 4750
g-cm.sup.2. The moment of inertia, Iyy, about the Y axis for the
golf club head 20 of the present invention will range from 2000
g-cm.sup.2 to 4000 g-cm.sup.2, preferably from 2500 g-cm.sup.2 to
3500 g-cm.sup.2, and most preferably from 2900 g-cm.sup.2 to 3300
g-cm.sup.2. The moment of inertia, Ixx, about the X axis for the
golf club head 20 of the present invention will range from 2000
g-cm.sup.2 to 4000 g-cm.sup.2, preferably from 2500 g-cm.sup.2 to
3750 g-cm.sup.2, and most preferably from 3000 g-cm.sup.2 to 3500
g-cm.sup.2.
In general, the golf club head 20 has products of inertia such as
disclosed in U.S. Pat. No. 6,425,832, and which is hereby
incorporated by reference in its entirety. Preferably, each of the
products of inertia, Ixy, Ixz and Iyz, of the golf club head 20
have an absolute value less than 100 grams-centimeter squared.
Alternatively, at least two of the products of inertia, Ixy, Ixz or
Iyz, of the golf club head 20 have an absolute value less than 100
grams-centimeter squared.
From the foregoing it is believed that those skilled in the
pertinent art will recognize the meritorious advancement of this
invention and will readily understand that while the present
invention has been described in association with a preferred
embodiment thereof, and other embodiments illustrated in the
accompanying drawings, numerous changes, modifications and
substitutions of equivalents may be made therein without departing
from the spirit and scope of this invention which is intended to be
unlimited by the foregoing except as may appear in the following
appended claims. Therefore, the embodiments of the invention in
which an exclusive property or privilege is claimed are defined in
the following appended claims.
* * * * *